EP0385760A2 - Luftreifen - Google Patents

Luftreifen Download PDF

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Publication number
EP0385760A2
EP0385760A2 EP90302146A EP90302146A EP0385760A2 EP 0385760 A2 EP0385760 A2 EP 0385760A2 EP 90302146 A EP90302146 A EP 90302146A EP 90302146 A EP90302146 A EP 90302146A EP 0385760 A2 EP0385760 A2 EP 0385760A2
Authority
EP
European Patent Office
Prior art keywords
butyl rubber
rubber
carcass
pneumatic tyre
inner liner
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP90302146A
Other languages
English (en)
French (fr)
Other versions
EP0385760B1 (de
EP0385760A3 (de
Inventor
Takafumi Taguchi
Kiyoshige Muraoka
Mamoru Uchida
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Rubber Industries Ltd
Original Assignee
Sumitomo Rubber Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=12896018&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0385760(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Sumitomo Rubber Industries Ltd filed Critical Sumitomo Rubber Industries Ltd
Publication of EP0385760A2 publication Critical patent/EP0385760A2/de
Publication of EP0385760A3 publication Critical patent/EP0385760A3/de
Application granted granted Critical
Publication of EP0385760B1 publication Critical patent/EP0385760B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
    • B60C1/0008—Compositions of the inner liner

Definitions

  • the present invention relates to a pneumatic tyre, and more particularly to a heavy duty pneumatic tyre.
  • Pneumatic tyres are well known having an inner liner located radially inside a carcass of steel cords, used because of their high strength.
  • the cords are corroded because of the presence of the air and moisture, and consequently the cords are likely to be broken and the adhesion between the cords and surrounding rubber material of the carcass is apt to be destroyed.
  • butyl rubber has been employed because of its high impermeability to air and moisture.
  • a rubber composition containing natural rubber is preferably employed in order to reduce heat generation in heavy duty use.
  • halogenated butyl rubber is widely used as the inner liner butyl rubber composition because it gives better co-vulcanisation (degree of similarity in respective optimum vulcanising conditions such as temperature and duration time) between the carcass rubber composition containing natural rubber and the inner liner comprising butyl rubber.
  • an inner liner made solely of halogenated butyl rubber is likely to become hard under the influence of oxygen in the air and heat generated in the running tyre, and this in combination with the bending stress in the running tyre frequently results in cracks in the inner liner.
  • Such a crack if it grows to reach the centre portion of the carcass then allows air and moisture to enter, and therefore, there is a fear of corrosion of the carcass cords, and consequently as previously mentioned, the corrosion gives rise to carcass cord breakage or separation problems due to the adhesion loss between the carcass cords and the surrounding rubber material.
  • an object of the present invention is to provide a heavy duty pneumatic tyre which is free from crack generation problems due to thermal hardening even if the tyre heats up to a high temperature while it is running, and furthermore, is highly impermeable to air and moisture and consequently capable of preventing carcass cord corrosion from occurring.
  • a pneumatic tyre having at least one layer of carcass reinforcement having each edge engaged with a respective bead core with each of the edges turned up outwardly from the inner side around each bead core, and an inner liner made of rubber composition located radially inside the carcass, wherein the rubber component of the inner liner rubber composition consists essentially of butyl rubber containing halogenated butyl rubber in the range of 60 to 95% by weight.
  • % means % by weight unless otherwise specified.
  • the halogen content in one molecule is preferably 5.0% or less, more preferably 3.0% or less, or still more preferably 2.5% or less in order to minimise thermal hardening at high temperature in use of the tyre. Additionally, to provide better co-vulcanisation with the rubber composition in the carcass, the halogen content is preferably 0.5% or more, more preferably 1.0% or higher.
  • halogenated butyl rubber examples include chlorinated butyl rubber, brominated butyl rubber and the like.
  • brominated butyl rubber is particularly suitable because brominated butyl rubber gives better co-­vulcanisation with the rubber composition in the carcass.
  • the halogenated butyl rubber can be obtained by halogenation of ordinary butyl rubber usually used for an automobile tyre (hereinafter referred to as "regular butyl rubber").
  • regular butyl rubber is isobutylene-isoprene copolymer normally having an isoprene content, i.e. a degree of unsaturation of the copolymer, in the range of 0.6 to 4.2 mole %.
  • Non-halogenated butyl rubber used together with the halogenated butyl rubber can be the aforementioned regular butyl rubber.
  • the inner liner rubber composition in accordance with the present invention may be prepared so that the rubber component thereof contains 60 to 95%, preferably 70 to 90%, of halogenated butyl rubber and 5 to 40%, preferably 10 to 30%, of the regular butyl rubber.
  • An inner liner rubber composition with an halogenated butyl rubber content in the rubber component of less than 60% exhibits insufficient characteristics with respect to co-vulcanisation with the carcass rubber composition which results in a danger of separation problems of the inner liner from the carcass.
  • an inner liner rubber composition with an halogenated butyl rubber content in the rubber component of more than 95% has a tendency to allow the outbreak of the crack problem.
  • the inner liner rubber composition can be obtained through a process wherein a rubber component consisting essentially of specified respective amounts of the halogenated butyl rubber and the regular butyl rubber is subjected to heating and mixing so as to become the particular rubber composition and the composition is shaped into the desired form.
  • the rubber composition may include other ingredients which are normally included in a conventional rubber composition. Examples of the aforementioned other ingredients are: an ingredient for improving reinforcement of the rubber, e.g. carbon black; an ingredient serving as vulcanising agent and to provide improved workability, e.g. process oil; an ingredient acting on butyl rubber as vulcanisation-retarder and preventing scorching, e.g.
  • MBTS mercaptobenzothiazyl disulfide
  • a vulcanisation accelerator e.g. zinc flower
  • a vulcanising agent e.g. sulfur
  • Figure 1 is a pneumatic tyre 10 of 11R 24.5 size having a tread portion 3, sidewall portions 6 extending from both edges of the tread portion 3 towards respective sides of the tyre, and bead portions 5 located respectively at radially inner edges of both sidewall portions 6.
  • Both edges of a carcass 2 are turned up outwardly from the axially inner sides respectively around a pair of bead cores 1 respectively on the right-hand side and on the left-hand side so as to be engaged with the bead cores 1 in the bead portions 5.
  • the carcass 2 comprises one layer of parallel steel cords each laid at an angle of about 90 o relative to the peripheral (hoop) direction.
  • the carcass may comprise two or more layers as occasion demands.
  • a bead reinforcing layer 8 is provided axially outside the carcass cord turn-up portion, and a bead apex 9 is located radially outside and adjacent to the bead core 1.
  • a belt layer 4 comprising steel cords is located radially inside the tread 3 and radially outside the carcass 2.
  • the belt layer 4 comprises a plurality of cord layers with cord directions intersecting at a relatively small angle.
  • the pneumatic tyre 10 has an inner liner 7 radially inside and adjacent to the carcass 2, and as mentioned previously, the inner liner 7 is made of a rubber composition containing 60-95% halogenated butyl rubber and 5 to 40% regular butyl rubber and other ingredients added as occasion demands.
  • Detail embodiments 1 to 5 and comparative examples 1 to 2 were mixed formulated according to Table 1.
  • the materials were halogenated butyl rubber (Bromobutyl 2255 (halogen content: 2%) available from Exxon Chemical Japan Limited, trade name); non-halogenated butyl rubber (Butyl 265, available from Exxon Chemical Japan Ltd, trade name); carbon black (Niteron 55S, available from Shin-Nittetsu Kagaku Kabushiki Kaisha, trade name); process oil, stearic acid, magnesium oxide and MBTS. These were all mixed and kneaded. Then, after zinc flower and sulfur were added, the mixture was further mixed and kneaded, and subsequently test pieces (55mm long, 55mm wide, 4mm thick) were prepared.
  • De Mattia Cut Growth as one of the post-­vulcanisation properties was measured in a manner wherein a 2mm wide crack at a surface strain of 60% was prepared on a test piece and the test piece was subjected to bending on a De Mattia fatigue test apparatus, so that the number of times of bending required for the crack width to grow by 1mm was investigated both in the normal (new) condition and in the aged condition in which the test piece had been previously aged by through heating from 150 hours at a temperature of 110 o C.
  • the adhesive property to the carcass was tested by adhering steel cords to a test piece and the test piece with the rubber composition was subject to pressure and vulcanising for 6 minutes at a pressure of 30 kg/cm2 and a temperature of 150 o C. Then the adhesive property was determined based on the procedure of JIS (Japanese Industrial Standard) K 6301.
  • a pneumatic tyre according to Example 6 of Table 3 of 11R 24.5 size having the construction shown in Figure 1 was made in which the same rubber composition of Example 3 was applied to the inner liner.
  • the pneumatic tyre of the present invention is free from crack generation problems due to thermal hardening even if the tyre heats up to a high temperature while it is running, and furthermore, the pneumatic tyre of the present invention is highly impermeable to air and moisture and consequently prevents carcass cord corrosion problems from occurring. Therefore the pneumatic tyre of the present invention can be suitably used as a tyre for, for example, heavy cargo trucks.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
EP19900302146 1989-03-02 1990-02-28 Luftreifen Expired - Lifetime EP0385760B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP51764/89 1989-03-02
JP1051764A JP2849110B2 (ja) 1989-03-02 1989-03-02 空気入りタイヤ

Publications (3)

Publication Number Publication Date
EP0385760A2 true EP0385760A2 (de) 1990-09-05
EP0385760A3 EP0385760A3 (de) 1991-01-30
EP0385760B1 EP0385760B1 (de) 1994-01-05

Family

ID=12896018

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900302146 Expired - Lifetime EP0385760B1 (de) 1989-03-02 1990-02-28 Luftreifen

Country Status (4)

Country Link
EP (1) EP0385760B1 (de)
JP (1) JP2849110B2 (de)
CA (1) CA2010580C (de)
DE (1) DE69005666T2 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0823454A1 (de) * 1996-08-06 1998-02-11 Bayer Ag Halogenierte Butylkautschuke mit einem geringen Halogengehalt
EP0832927A1 (de) * 1996-09-25 1998-04-01 Continental Aktiengesellschaft Kautschukmischung für Innenseelen von Fahrzeugluftreifen
US5889123A (en) * 1996-10-07 1999-03-30 Bayer Aktiengesellschaft Polymer compounds and their use for the vulcanization of halogenated butyl rubbers with a low halogen content

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04191101A (ja) * 1990-11-26 1992-07-09 Sumitomo Rubber Ind Ltd 航空機用タイヤ
JP4338365B2 (ja) * 2002-07-02 2009-10-07 横浜ゴム株式会社 タイヤ用ゴム組成物
KR101006016B1 (ko) 2003-10-14 2011-01-06 요코하마 고무 가부시키가이샤 환상 폴리설파이드를 가황제로서 함유하는 고무 조성물 및이를 사용하는 공기 주입 타이어
JP4439251B2 (ja) 2003-12-12 2010-03-24 株式会社ブリヂストン 空気入りタイヤ
JP4898402B2 (ja) * 2006-11-24 2012-03-14 住友ゴム工業株式会社 再生インナーライナー用ゴム組成物の製造方法
CN103121379B (zh) * 2006-12-29 2015-06-24 普利司通美国轮胎业务有限公司 轮胎内衬层
JP6220247B2 (ja) * 2013-11-29 2017-10-25 住友ゴム工業株式会社 インナーライナーのストリップワインド成形装置と成形方法および空気入りタイヤ
JP6862695B2 (ja) * 2016-07-01 2021-04-21 横浜ゴム株式会社 インナーライナー用ゴム組成物

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2698041A (en) * 1951-06-30 1954-12-28 Goodrich Co B F Hollow fluid-containing article comprising brominated rubbery interpolymer
GB2072576A (en) * 1980-04-02 1981-10-07 Exxon Research Engineering Co Ahring a halobutyl rubber to an unsaturated rubber
EP0127998A2 (de) * 1983-06-01 1984-12-12 Polysar Limited Schlauchloser Luftreifen
US4587302A (en) * 1985-03-25 1986-05-06 Hercules Incorporated Butyl rubber and chlorinated rubber composition

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61176648A (ja) * 1985-02-01 1986-08-08 Yokohama Rubber Co Ltd:The タイヤのインナ−ライナ−用ゴム組成物
JPS6382802A (ja) * 1986-09-26 1988-04-13 Ohtsu Tire & Rubber Co Ltd 空気入りタイヤ

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2698041A (en) * 1951-06-30 1954-12-28 Goodrich Co B F Hollow fluid-containing article comprising brominated rubbery interpolymer
GB2072576A (en) * 1980-04-02 1981-10-07 Exxon Research Engineering Co Ahring a halobutyl rubber to an unsaturated rubber
EP0127998A2 (de) * 1983-06-01 1984-12-12 Polysar Limited Schlauchloser Luftreifen
US4587302A (en) * 1985-03-25 1986-05-06 Hercules Incorporated Butyl rubber and chlorinated rubber composition

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0823454A1 (de) * 1996-08-06 1998-02-11 Bayer Ag Halogenierte Butylkautschuke mit einem geringen Halogengehalt
US5886106A (en) * 1996-08-06 1999-03-23 Bayer Aktiengesellschat Halogenated butyl rubbers having a low halogen content
EP0832927A1 (de) * 1996-09-25 1998-04-01 Continental Aktiengesellschaft Kautschukmischung für Innenseelen von Fahrzeugluftreifen
US5889123A (en) * 1996-10-07 1999-03-30 Bayer Aktiengesellschaft Polymer compounds and their use for the vulcanization of halogenated butyl rubbers with a low halogen content

Also Published As

Publication number Publication date
JP2849110B2 (ja) 1999-01-20
EP0385760B1 (de) 1994-01-05
DE69005666D1 (de) 1994-02-17
CA2010580A1 (en) 1990-09-02
JPH02231202A (ja) 1990-09-13
EP0385760A3 (de) 1991-01-30
CA2010580C (en) 1999-09-21
DE69005666T2 (de) 1994-04-28

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